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. However, bearing dislocation is still reported as the predominant mechanism of failure in mobile-bearing UKAs. 49 Mechanical loosening, lateral OA and unexplained pain are other mechanisms of failure, with revision for patellofemoral problems and PE
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trochanter fracture ( n = 1, 0.4%), modular neck fracture ( n = 1, 0.4%) and unexplained pain ( n = 1, 0.4%). Revision rate There were 32 failures in total necessitating revision surgery in the 268 cases (11.9%). Seven hip resurfacings failed
National Institute for Health Research Bristol Biomedical Research Centre, University Hospitals Bristol NHS Foundation Trust and University of Bristol, UK.
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National Institute for Health Research Bristol Biomedical Research Centre, University Hospitals Bristol NHS Foundation Trust and University of Bristol, UK.
North Bristol NHS Trust, Southmead Hospital, Bristol, UK.
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National Institute for Health Research Bristol Biomedical Research Centre, University Hospitals Bristol NHS Foundation Trust and University of Bristol, UK.
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surgery for chronic pain after TKA should not be performed unless the cause of pain is clearly identified as implant-related, as revision surgery for unexplained pain has consistently been shown to result in poor outcomes. 91 - 93 Chronic pain after
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a titanium TKA four years after UKA. 110 Despite the numerous pathophysiological explanations for symptoms after UKA, there remains a subgroup of patients with unexplained pain. This vexing problem does not justify revision as studies demonstrate
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unexplained pain, assessed by two observers who were blind for clinical data. 31 Hybrid SPECT/CT of THA has recently been shown to be reliable in excluding aseptic loosening as well as being beneficial with reference to the extent and maturity of
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not significantly associated with adverse outcomes, caution should be exercised when attributing unexplained pain to PFJ overstuffing, and revision should not be performed for this alone. Table 3 Comparison of overstuffed and unstuffed knees by
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23, 24 to 43 and ⩾ 44). They concluded that low volume hospitals performing ⩽ 11 Oxford III UKAs per year were associated with an increased risk of revision compared with higher volume hospitals, and unexplained pain as the revision cause was more
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infection, one case of arthrofibrosis, and two cases of failure due to unexplained pain. The most common complication after UKA was mobile-bearing dislocation in the mobile-bearing knees and loosening of the prosthesis in the fixed-bearing knees, but
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% Reason for revision, revised (O/E) Unexplained pain 408 (0.96) 1198 (1.03) 193 (0.57) 1198 (1.15) Infection 504 (0.88) 3184 (1.04) 821 (0.90) 3184 (1.05) Socket fracture 205 (1.71) 62 (0.44) 20 (1